\begin{tikzpicture}
	\tkzDefPoints{0/0/Q, 1.5/0/C, -1.0/1.5/D, 0/1.5/M, -1.0/0/N}
	\tkzDrawSegments(Q,C  Q,D)
	\tkzDrawSegments[dashed](Q,M  Q,N)
	\tkzMarkRightAngle(M,Q,C)
	\tkzLabelPoints[left](D)
	\tkzLabelPoints[below](C, Q)
\end{tikzpicture}

